Come swap some seeds and gardening know-how with local gardeners and growers at Mill City Grows' Annual Seed Swap. If you have seeds to share, bring them, and choose from more then 1,000 available seed packets available. Mahoney's Garden Center will also be on site selling seedlings. The Seed Swap launches Lowell's month-long series of Earth Day events, and takes place in conjunction with Western Avenue Studios' First Saturday Open Studios. Free and open to the public.